Properties of the liquid surface layer. Wetting, capillary phenomena.

Unit    Liquid bodies

School:

Teacher:

Date:

Grade 10

Lesson Topic

Properties of the liquid surface layer. Wetting, capillary phenomena

Learning objective

10.2.4.2 – to explain  the liquid surface tension and the role of the  capillary phenomena in daily life;

Lesson Objectives:

Students will be able to

•                    Define the surface tension;

•                    describe the process of capillary

•                    distinguish between wetting and non-wetting fluid

•                    explain the capillary effect and

•                    give examples from everyday life

Assessment Criteria

Learners achieve the learning objectives if  they correctly define the surface tension; able to distinguish between wetting and non-wetting fluid, correctly explain the capillary effect and give examples from everyday life, describe the process of capillary

Language objectives

Language learning objective: Learners can confidently express their views about process of capillary and surface tension

Subject-specific vocabulary & terminology: surface tension, the process of capillary, wetting, energy, force.

Useful set(s) of phrases for dialogue/writing:

 Surface tension results from the direction of the…...

The smaller the dimensions of a system are, the more……

Water is trying to form the shape with the smallest…………

Wetting is the ability of a liquid to maintain contact with………, resulting from intermolecular interactions when…….

Surface tension is generally expressed in…….(SI unit).

Cross-curricular

Links

English vocabulary, Mathematics, Chemistry, Biology

ICT skills

Using a Smart board, laptops

Preliminary

Knowledge

Students should have learnt about   fluid properties in grades 7,  interaction of  molecule 

attractive forces of molecules in grades 8.                 

Lesson Procedure

Stages of the lesson

Activity planned for the current lesson

Sources

Knowledge activation

 2 minutes

(W) Teacher greets the class, notes the date and registers students. Students indicate their presence verbally.

The teacher asks about the previous lesson content. Students provide answers

Smartboard

5 minutes

(W) Starter activity:

Introduction.

The students watch the resource “The Surface tension of liquids” №2,3e

https://bilimland.kz/en/courses/physics-en/molecular-physics/the-properties-of-gases-liquids-and-solids/lesson/the-surface-tension-of-liquids

The students write a notes  in a copybook.

Smartboard

Setting the lesson objectives

3 minutes

The teacher introduces the Learning Objectives and Lesson Objectives. Students listen and note the lesson objectives in their copy books.

PHY_10_15_V1_P_Properties of the liquid surface layer. Wetting, capillary phenomena. Slides 1-3

Studying new content

10 minutes

 (I) Open book assessment

Students read the course book (pages 280-282)

Students can read surface tension and capillarity from Coursebook (p.280-282)

(G) The students discuss in pairs, explain to each other.

Course book/page 280-282

Douglas C. Giancoli

10 minutes

(W) The teacher show the PowerPoint presentation and explains the surface tension, wetting, explain the capillary effect and give examples from everyday life.

Discussion Questions: Ask the students and discuss as a class:

1. How do water bugs walk on the surface of the water?

2.  Why do soap bubbles form spheres instead of cubes?

3. What happens when a soap bubble pops?

4. Why does a stream of water form droplets as it falls?

PHY_10_15_V1_P_Properties of the liquid surface layer. Wetting, capillary phenomena.

   8 minutes

 (I) (f) The teacher issues “Surface tension”worksheet.  Every student solve two problems. The students compare the answers that are attached at the end of the task.

PHY_10_14_V1_DM_Properties of the liquid surface layer. Wetting, capillary phenomena.

Reflection

2 minutes

Teacher reviews the lesson objectives with students

Teacher issues homework to students

Stickers

Homework

They answer question Reading Worksheet on the surface tension and capillarity Course book/page 280-282  Douglas C. Giancoli

They must to solve four problems

Reflection on the taught lesson

1) Have all students attained the LO? If not, why?

2) How did the differentiation contribute to the achievement of the objectives of the lesson?

3) Have the time allotment in every part of the lesson been followed?

4) What were the deviations from the lesson plan and why?

5) What could help improve the lesson (think of both teaching and learning)?